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Segment Reporting Summary of Revenues (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]        
Number of Reportable Segments     4  
Rental and related revenue $ 201,996 $ 204,780 $ 416,611 $ 413,426
General contractor and service fee revenue 23,901 69,512 76,722 125,332
Revenues 225,897 274,292 493,333 538,758
Disposal Group, Including Discontinued Operation, Revenue 49 29,331 32,164 59,403
Total Revenues Including Revenues Related To Discontinued Operations 225,946 303,623 525,497 598,161
Operating Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenues 223,353 272,944 488,965 536,431
Operating Segments [Member] | Industrial [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 135,487 128,263 283,115 261,554
Operating Segments [Member] | Medical Office [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 40,274 34,954 80,302 68,264
Operating Segments [Member] | Office [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 23,691 38,586 48,826 77,565
Operating Segments [Member] | All Other Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 0 1,629 0 3,716
Operating Segments [Member] | Service Operations [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
General contractor and service fee revenue 23,901 69,512 76,722 125,332
Corporate, Non-Segment [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Rental and related revenue 2,544 1,348 4,368 2,327
Disposal Group, Including Discontinued Operation, Revenue $ 49 $ 29,331 $ 32,164 $ 59,403